Injector



Nov. 3, 1931. J. D. MccLlNTocK INJECTOR Filed MaICh l, 1950 i UNirsnSTATES;

,j .ioiiN n. MccLIN'rocx, or PHILADELPHIA,

SELLER-s a coivIPANY,iNocia-PRATED, or PHILADELPHIA, PENNSYLVANIA, Aoonv PORATION OF PENNSYLVANIA Y Application led March 1,

vof steam and water within the ra-nge of maximum and minimum capacitiesof the injector, etc. Such abnormal conditions ef.- fect theeficientoperation of the injector variously. as by causing wastage of water,blowing backl of steam through Vthe water supply, etc., or cause it tocease to function, and require immediate correction; v v

The failure of an 1'njector may be ordinarily readily observed where theinjector .is placed in an observable position, as in a stationary plant,but such is not the case, more particularly, ona locomotive wherel dueto restricted space the injector is installed outside of the cab and isnon-observable by either the engineer or the reman, who ordinarily canonly determine failure of the injector from observation of the'fact thatthe boiler is not receiving water. Y

Heretofore various `means have` been suggested for indicating failure ofan injector at a remote point` as in the cabl of a locomotive and suchmeans have involved-in one case the provision of a pipe leading from theinjector through which steam is discharged to attract an operatorsattention when the injector ceases to function properly and in` anothercase, as disclosed in U.V S. Letters Patent No. 1,318,089, dated October7, 1919, the provision of an indicator so arranged as V to be hiddenunder the infiuence of vacuum in the injector when it is functioningnormally and to appear on breaking of the vacuum on failure of theinjector. Such means have, however, not proved entirely satisfactory intheI one case due to failure to f observe the telltale and in the otherdue to the unpleasant effect of the escaping steam.-

Now, it is the object of my invention to provide improved means forindicating fail PATENT ortica PENNSYLVANIA, ASSIGrlSl'OR` TO -WILLIAMINJECTOR 1930. Serial No. 432,527.l

ure of an injector, of such character as to l indicate at a point remotefrom the injector, as in the cab of a locomotive, and so constructed asto indicate normal eiicient voperation and failure of an injector in adefinite and readily observable manner,

\ Having indicated in a general way the nature and purpose of myinvention, I will proceed to a more detailed description thereof withreference to the accompanying draw* linginwhich I have illustrated apreferred embodiment and in which the single figure isa sectional viewof an injector with associated indicating means embodying my invention.v

In the drawing @indicates the casing of i an injector of. usualconstruction and within which is a combining tube b, a steam nozzle@ anda delivery tube d. e indicates a steam inlet suitably controlled by avalve and which communicates with the steam nozzle e, while f indicatesa water inlet suitably controlledy by a valve, not shown, and gindicates the outlet from the injector to the'boiler. The

combining tube Zi is provided with an overflow z, which communicateswith a chamber z' provided with an outlet y' which communi- 'Gates witha waste pipe, there being a valve,

not shown, between outlet 7' and thewaste pipe, as shown, forexample,'in United States Patent No. 1,318,089.

Connected to the overflow chamber z' of the injector is a pipe 7c whichleads to a casing m, desirably` positioned in the cab of a locomotive,or other position remote from the,V y..

injector. yIVithinthe casing m is an aperi tured seat a beneath which isformed a cylinder o'witliin which is positioned a piston p. The lowerend'of the cylinder o is closed by 'means of ascrew plug having acentral borep.y

through which extends a stem g secured tob piston p5 A conduit 1 in thecasing m connects cylinder o with yan outlet s, discharge through theconduit being controlled by a ball check t. v f

vIn the operation of the I my invention, for c example, as describedabove, it will be understood that when theaujector is operatingefliciently, the. overflow Ichamber i will be under partial vacuum in T3device embodying check t and further protected by the piston,V when inposition against theseatn. Se long as the injector continues to operateeiiciently,1

the stein g Will be withdrawn from the seat under the influence of thevacuum in chaine..

ber z' as communicated to cylinder o as described. Should thenormal"operationv ofthe injector be interrupted, forjenample, by thecessation of they `supplywcf -Water Yor.s,` teain, the partial vacuuminr chamber .i Willjbe Llost and chamber will receive. steam underpresvsure from the over-flew chamberaof the com;

in overflow chamber yi, the lpartial' vacuum in cylinder 0 Will be lostand the pistonvp yvill drop in cylinder o of itslownweight, V'or underthe influence of steam pressure, ,causing stem Q to be extended throughthe plugV closing the open end of the cylinder. The'stem g, Which isdesirably painted 'red and which,

as has been indicated, is hidden .during.' eifl-V cient operation of theinjector will, on'loss of the partial vacuum, comeuinto vieuT :and actasa signal of the facttliattheinjector has ceased to operate.`Steam,"vhen.dis charged intooverflowr chamber `z', passes through pipe'k and intdcylinder o, from which it passes through the outlets, raisingthe ball check t in its passage. The outlets is desirably connected tordischarge intofthe atmosphereat a point Where it may be observed by anoperator, and Where tliade'vice is positioned in a locomotive cab, itmay,'for example, discharge j ustA above the funnel :positioned toreceive discharge fromythe boiler test cocks. L It will new be observedthat tliedevice embodying my invention provides a dual indication of theefficient'and ineflicientV operation of the injector. Vliere theinjector is operating efficiently, the stein g of the 'indicator isWithdrawn from the seat andthere is no steam discharged from the outlet8.

However, when the Iinjector zceases to operate' 4 the lstem g isimmediately proj ected-into view bining tube. On loss of thepartialyacuui "cylinder'and adapted to bepositioned under'2v f chamber,and means associated with the indicator for permitting the escape ofsteam when the` overflow Vchamber is under steam pressure Within theoverflow chamber.

2. Inconibination, an injector including Y anoveriiow chamber normallyunder partial Vvacuum when the injector is functioning corL rectly andadaptedto receive steam under pressure when the injector ceases tofunction correctly, an indicator operable by relative pressure'vvithin'said overflow chamber and means associated with said indicatorfor permitting the escape of steam when said overfioW is under steampressure, said means be- (i0 ing varranged to prevent'the Vcommunicationof atmospheric pressure to Isaid .overiow chamber. 4 j i 3; vIncombination, an injector including an loverflow chamber normally underpartial E66 vacuum when the inj ector is functioning correctly' andadaptedto receive steainunder pressure When the injector ceases tofunction correctly, a cylinder, a conduit affording communicationbetween said chamber and saidflOO cylinder, a piston in said cylinder, astem carried by said piston, saidpiston being adapted to be positionedunder the influence of pressureito extend'said stem Without said` '105thel influence of partial vacuum Within's'aid overflow chamber toWithdraw said 'stem Within the cylinder, a conduit affording an outletfrom said cylinder and acheck valve insaid' conduit arranoed to permitdischarge@ 110 of steam from the cylinder.

' In testimony of which invention, I have JOHN D. MOCLINTOCK.' "1115 andsteam is discharged from the outlet :sf

In the device embodying inventionthe 55 ball check t and the piston pseated against the seat n serve to positively prevent iny I j ioW of airthrough outlet s to the detriment of the partial vacuum in overflowchamber-z'.

It will be understood that the embodiment of my invention describedmaybe variously modified Within the scope of myinvention. It Will befurther understood that the Vdevice Y

